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Q.

Consider the following system of questions 

αx+2y+z=1 , 2αx+3y+z=13x+αy+2z=β
For some α,β . Then which of the following is NOT correct.
 

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a

It has no solution if α=1  and  β2

b

It has no solution for α=1   and for all  β

c

It has no solution for  α=3 and for all β2

d

It has a solution for all  α1 and  β=2

answer is B.

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Detailed Solution

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D=|α212α313α2|=0α=1,3

Dx=|211311α2β|=0β=2Dy

=|α112α1132β|=0

Dz=|α212α313αβ|=0

β=2,α=1

α=1,β=2 Infinite solution

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